Compared to the brains of healthy young animals, the brains of healthy older animals exhibit and , especially when individuals from both groups have been maintained in enriched environments with adequate sensory stimulation, leading to additional changes in neuronal structure, including :

Life, yes life it self madden

Aplant cell has vacuoles and a cell wall

The rate that would change would be the  searching efficiency/attack rate. there are only two other rates in this model: the  growth rate of prey, and the  predator or consumer mortality rate.the  searching efficiency/attack rate is what indicates how effectively can a predator capture its prey whether in the searching process or actual capturing/attacking process.